{"id":18239,"date":"2026-08-07T14:06:59","date_gmt":"2026-08-07T06:06:59","guid":{"rendered":"https:\/\/long-join.com\/?p=18239"},"modified":"2026-08-07T14:08:31","modified_gmt":"2026-08-07T06:08:31","slug":"why-is-adjustable-lux-more-prone-to-misoperation-compared-to-fixed-lux","status":"publish","type":"post","link":"https:\/\/long-join.com\/it\/why-is-adjustable-lux-more-prone-to-misoperation-compared-to-fixed-lux\/","title":{"rendered":"Why Is Adjustable Lux More Prone to Misoperation Compared to Fixed Lux?"},"content":{"rendered":"
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Why Is Adjustable Lux More Prone to Misoperation Compared to Fixed Lux?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\til nostro video<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Introdurre<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Lux photocells<\/u><\/a>\u00a0read the light level and decide when to switch. Most systems offer two versions: fixed threshold and adjustable threshold.<\/p>

\u00a0<\/p>

Fixed lux is preset at the factory. It stays the same.<\/p>

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Adjustable lux lets someone turn a dial and change when the lamp switches. This sounds flexible. In practice, it is where most of the problems come from.<\/p>

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This article explains why adjustable lux creates so many faults. The answer is simple: every time someone adjusts the threshold, they have a chance to get it wrong.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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adjustable lux vs fixed lux photo control<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Basics of Lux Photocells<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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A dial or digital interface lets the user change the on\/off threshold. You can tune it to your site’s specific light conditions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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You can also tune it wrong.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Fixed Lux Photocell<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The factory set a threshold. Lights turn on at that point, turn off at another point. No dial to turn. No adjustment screen.<\/p>

\u00a0<\/p>

It just works.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Key Difference<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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One requires adjustment. One does not.<\/p>

\u00a0<\/p>

That single difference cascades into everything else: how many ways it can fail, how much training the installer needs, how many calls come in after installation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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202 series photo controller<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Advantages of Fixed Lux Photocells<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Fixed lux eliminates the adjustment step entirely.<\/p>

\u00a0<\/p>

That sounds obvious, but it matters. A fotocellula<\/u><\/a>\u00a0with no dial cannot be dialed wrong. It reads the ambient light, compares it to a factory threshold, and switches based on physics, not guesswork.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Causes of Misoperation in Adjustable Lux Photocells<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Causa<\/b><\/strong><\/p><\/td>

Fault Manifestation<\/b><\/strong><\/p><\/td>

Spiegazione<\/b><\/strong><\/p><\/td><\/tr>

User sets Lux too low<\/p><\/td>

Photocell\u00a0mistakenly detects “dark,” causing daytime lighting<\/p><\/td>

Lights wrongly ON during the day, wasting energy<\/p><\/td><\/tr>

User sets Lux too high<\/p><\/td>

Lamp not triggered, stays OFF at night<\/p><\/td>

Lighting fails at night, compromising safety<\/p><\/td><\/tr>

User misunderstands Lux value concept<\/p><\/td>

Confuses threshold with brightness or delay time<\/p><\/td>

Misconceptions cause improper adjustments<\/p><\/td><\/tr>

User adjusts Lux during the day<\/p><\/td>

Temporary threshold offset, erroneous judgments<\/p><\/td>

Causes abnormal system response and irregular lighting behavior<\/p><\/td><\/tr>

Adjusted due to cloudy days causes winter faults<\/p><\/td>

Lights may fail to trigger correctly all day<\/p><\/td>

User compensation for dim weather leads to overadjustment<\/p><\/td><\/tr>

Adjusted in rain causes failure on sunny days<\/p><\/td>

Threshold too high, lights fail to turn on after rain subsides<\/p><\/td>

Lack of dynamic environment consideration<\/p><\/td><\/tr>

Ignores LED light reflection when adjusting<\/p><\/td>

Strong reflections cause inaccurate photocell readings<\/p><\/td>

Triggers untimely ON\/OFF cycles<\/p><\/td><\/tr>

Does not consider fixture’s installation direction<\/p><\/td>

Incorrect trigger due to light path and sensor alignment<\/p><\/td>

Installation impacts sensor sensitivity<\/p><\/td><\/tr>

Ignores fixture height (especially high mast lights)<\/p><\/td>

Higher Lux setting to avoid false trigger, causing no light at night<\/p><\/td>

High mast altitudes demand special Lux settings<\/p><\/td><\/tr>

Ignores ambient reflection factor<\/p><\/td>

Light refraction<\/a>\u00a0and environmental changes cause wrong judgments<\/p><\/td>

Environmental brightness variability causes fault<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Why Adjustable Lux Fails In the Field<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The fundamental issue is simple.<\/p>

\u00a0<\/p>

Lux is not intuitive. Most people do not think in lumens per square meter. They think “the light is on” or “the light is off.” When someone sees the system misbehaving, their instinct is to turn a dial, any dial, hoping it helps.<\/p>

\u00a0<\/p>

But lux is not brightness. It is not a delay timer. It is a light intensity threshold. Turn it down and the lamp switches on when it is brighter. Turn it up and it needs to be darker before it switches. The logic is backwards from what most people expect.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Why Fixed Lux Works Better<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Fixed lux\u00a0eliminates adjustment.<\/p>

\u00a0<\/p>

It also eliminates the whole category of adjustment error. No more turning the dial. No more seasonal retuning. No more “the weather is different today so I will fiddle with settings.” The threshold stays the same, and the photocell does its job based on physics, not guesswork.<\/p>

\u00a0<\/p>

Long-Join’s fixed lux photocells are set at the factory to a threshold that works<\/u><\/a>\u00a0across most normal outdoor conditions. You install it, lock it down, and it switches when the real dusk and dawn arrive. It does not care if today is cloudy or clear because it is measuring actual light intensity, not reacting to your adjustment.<\/p>

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For road lighting, this is critical. A city cannot adjust every streetlight individually during winter. A highway cannot have technicians out tuning photocells in April because the season changed. Fixed lux removes that maintenance burden and the human error that comes with it.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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two type head pole light fixture<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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When Adjustable Lux Makes Sense<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Adjustable lux\u00a0is not useless. It has a place.<\/p>

\u00a0<\/p>

Specific unusual installations, where the normal factory setting genuinely does not work, benefit from adjustment. A fixture buried under a tree canopy, or mounted in a way that creates local reflection issues, or in a climate extreme that the factory did not anticipate. In those rare cases, an adjustable dial is the solution.<\/p>

\u00a0<\/p>

But the rule should be: start with fixed lux. Reach for adjustable lux\u00a0only if fixed does not work for your specific site. Do not assume adjustable is better because it offers more control. Control is only good if the person using it understands lux values, outdoor lighting physics, and how their specific site’s geometry affects light sensing.<\/p>

\u00a0<\/p>

Most installations do not have that knowledge on staff.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Domande frequenti<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tWhich is more suitable for standard road lighting: adjustable or fixed Lux photocells?<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
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Fixed lux. Road lighting has standardized conditions across most sites. The factory threshold handles this well.<\/p><\/span>\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tHow to correctly set the threshold on adjustable Lux photocells?<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
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If you must adjust, do it at actual dusk or dawn, not during the day. Set it at the light level where you want switching to occur, not at random times based on weather.<\/p><\/span>\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tHow to avoid misadjustment if users are unfamiliar with Lux values?<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
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Do not use adjustable lux with untrained users. Pick a fixed lux model.<\/p><\/span>\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tWhat are typical symptoms of misoperation in Lux photocell use?<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
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Light stays on all day. Light fails to come on at night. Light cycles on and off multiple times during dusk or dawn.<\/p><\/span>\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\tWhat anti-misoperation features do LongJoin photocell products offer?<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t
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Long-Join emphasizes fixed lux designs for reliability. The photocells are set at the factory to stable thresholds that work across common outdoor conditions.<\/p><\/span>\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Conclusione<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Adjustable lux offers flexibility that sounds useful until someone actually uses it.<\/b><\/strong><\/p>

\u00a0<\/b><\/strong><\/p>

In the field, it becomes the source of most problems. A user adjusts based on one moment’s conditions and breaks performance in another moment. A technician tries to solve a seasonal issue and creates a different seasonal issue. Without deep understanding of lux values and outdoor light physics, every adjustment is a gamble.<\/b><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Link esterni:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\u25cfhttps:\/\/www.sciencedirect.com\/topics\/engineering\/photocell
\u25cfhttps:\/\/en.wikipedia.org\/wiki\/Refraction<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Adjustable lux offers flexibility that sounds useful until someone actually uses it.
\nIn the field, it becomes the source of most problems. A user adjusts based on one moment’s conditions and breaks performance in another moment. A technician tries to solve a seasonal issue and creates a different seasonal issue. Without deep understanding of lux values and outdoor light physics, every adjustment is a gamble.<\/p>","protected":false},"author":1,"featured_media":18240,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"categories":[1,88,68],"tags":[],"class_list":["post-18239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-long-join-blog","category-nema-controller","category-recent-post"],"acf":[],"_links":{"self":[{"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/posts\/18239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/comments?post=18239"}],"version-history":[{"count":4,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/posts\/18239\/revisions"}],"predecessor-version":[{"id":18246,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/posts\/18239\/revisions\/18246"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/media\/18240"}],"wp:attachment":[{"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/media?parent=18239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/categories?post=18239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/long-join.com\/it\/wp-json\/wp\/v2\/tags?post=18239"}],"curies":[{"name":"parola chiave","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}